Cornell University

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LASSP & AEP Seminar by Xiaoliang Qi (Stanford University)

Tuesday, September 26, 2023 at 12:20pm to 1:30pm

Clark Hall, 700 142 Sciences Drive

Xiaoliang Qi

Emergent spacetime from generalized free fields

Holographic duality is the proposed correspondence between a quantum field theory and a gravitational theory with one higher dimension. This duality suggests that spacetime may emerge from quantum entanglement and correlation in many-body systems. In this work, we propose a new protocol to construct a dual free bulk theory using only data from a boundary model of generalized free fields (GFFs). This approach is doesn't rely on pre-defined bulk equations of motion; the bulk emerges organically from the boundary data. We apply this approach to the Sachdev-Ye-Kitaev (SYK) model and its variations, and study the dual geometry for the thermal state, thermal field double state and some time-dependent states. We find black hole geometry, shockwave geometries and tranversible wormholes, in consistency with the expectation at low energy. Our result enables the definition of dual geometry (at least at the two-point function level) beyond the low temperature, nearly conformal region. Our approach also provided new understanding on the universality of black hole horizon physics.

Ref: Tamra Nebabu and Xiaoliang Qi, arxiv:2306.16687

Xiaoliang Qi is the recepient of 

  • Simons Investigator, Simons Foundation (2018)
  • The New Horizons in Physics Prize, The Breakthrough Prize Foundation (2015)
  • Sackler International Prize, Physics, Raymond and Beverly Sackler, Tel Aviv University (2014)
  • Hermann Kummel Early Achievement Award, in Many-Body Physics, International Conference Advisory Committee (2011)
  • Packard Fellowship, David and Lucile Packard Foundation (2011)
  • Sloan Fellowship, Sloan Foundation (2010)

Faculty Host: Chao-Ming Jian

Pizza served starting at 12:10 p.m.

Please bring your own beverage.

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lassp_and_aep_seminar, lassp, quantum_site



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Xiaoliang Qi

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Stanford University

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